Question

Pipe ‘A’ takes 15 minutes to fill a tank. Pipe ‘B’ takes 25 minutes to empty the same tank. If pipe ‘B’ is opened 11 minutes after pipe ‘A’, then find the total time taken to fill the tank in this manner.

A 20 minutes
B 26 minutes
C 21 minutes
D 27 minutes
E 11 minutes
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